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Mineral Nutrition Test - 58

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Mineral Nutrition Test - 58
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  • Question 1
    1 / -0
    Chlorosis is caused due to deficiency of 
    Solution
    Chlorosis is a condition in which the leaves produce the insufficient amount of chlorophyll. It causes the yellowing of leaves. Magnesium is the main component of the chlorophyll so its deficiency causes insufficient production of leaves. The plant affected by chlorosis has little or no ability to manufacture carbohydrates through photosynthesis. Mineral deficiency in the soil, deficient nitrogen, poor drainage are some common cause of the chlorosis.
    So, the correct answer is option A.
  • Question 2
    1 / -0
    The cluster of genes, which regulate nodulation, of legume, possess, host specificity and are responsible for nitrogen fixation are
    Solution
    The genes responsible for fixation of nitrogen in legume plant is Nod gene. Nod factor or nodulation factor are produced by bacteria called rhizobia during initiation of nodules. A symbiosis relationship is formed when roots take up rhizobia. Rhizobia produces nitrogen for plants, and legume produces leghemoglobin to carry away oxygen, that would inhibit nitrogenase activity.
    hence correct answer is option A.

  • Question 3
    1 / -0
    A legume having a symbiotic association with both of the nitrogen-fixing bacteria Rhizobium and Azorhizobium  is?
    Solution
    Sesbania rostrata is a small semi-aquatic leguminous tree, in the genus Sesbania. It forms a symbiotic relationship with Gram-negative Rhizobia and Azorhizobium which leads to the formation of nitrogen-fixing nodules on both stem and roots.
    So the correct answer is 'Sesbania rostrata'
  • Question 4
    1 / -0
    Deficiency symptom of nitrogen and potassium are visible first in 
    Solution
    The deficiency of potassium in plants is first visible in the leaves. They start turning yellow and brown scorches are also seen. Similarly, the first symptoms of nitrogen deficiency in plants are also observed in the yellowing of leaves. This is because plants are unable to make enough chlorophyll and hence start appearing pale green or yellow.
    So, the correct answer is 'Senescent leaves'.
  • Question 5
    1 / -0
    Hydroponics is growing of plants 
    Solution
    Hydroponics is part of hydroculture and within this, the plant is growing in a soilless medium or in an aquatic-based environment, it uses only the mineral nutrient solution to feed the plants.
    So, the correct answer is option D.
  • Question 6
    1 / -0
    Oil yielding legume is
    Solution
    Soybean is commonly known as Glycine max. It belongs to the family of legumes. It provides the fermented products like milk, tofu etc. Oil of Glycine max is rich in linoleic and oleic components. It is used for many industrial purposes, e.g., in the manufacture of soaps, glycerine, linolenic, etc. It has a nitrogen-fixing ability and helps in the enrichment of soil with nitrogen.
    So, the correct answer is option B.
  • Question 7
    1 / -0
    An essential element is that which
    Solution
    An essential element should have following features:-
    1. The element must be absolutely necessary for supporting normal growth and reproduction of plants. In the absence of the element, the plants do not complete their life cycle or set the seeds.
    2. The element must be directly involved in the metabolism of the plant. It should form a component of either a structural or functional molecule.
    3. The requirement of the element must be unique and not replaceable by another element.
    4. Absence or reduced availability of the element causes disorders.
    5. The disorders caused by absence or deficiency of an element can be corrected only by the availability of that element.
    Based upon these features, 17 elements have been found to be essential for plant growth and metabolism. They are C, H, O, N, P, K, Ca, Mg, S, Fe, B, Mn, Cu, Zn, Mo, Cl and Ni.
  • Question 8
    1 / -0
    If all the microorganisms are destroyed on earth then
    Solution
    Microorganism plays an important role in the enrichment of soil. The dead and decaying matter in the soil is decomposed by the microorganism in the soil. Nitrogen-fixing microorganism breaks the complex compounds like proteins into amino acids and finally to nitrogen and increases the fertility of the soil. If all the microorganism are destroyed on earth then the soil will be depleted from nitrogen.
    So, the correct answer is option D.
  • Question 9
    1 / -0
    The chemical fertilizer required for better rhizobial nitrogen fixation is ______. 
    Solution
    Nitrogen fixation is a process of conversion of atmospheric nitrogen into its compounds. The process of nitrogen fixation requires a reducing power, energy source (ATP), dinitrogenase enzyme, and compound for trapping $$NH_3$$. Phosphorous increased the nitrogen-fixing capacity of legumes plants, stimulates the root production, helps in the transformation of sugar, energy transfer, etc.
    Hence, the correct answer is option A, i.e., Phosphorus.
  • Question 10
    1 / -0
    Root nodules for nitrogen fixation of a non-leguminous tree possess
    Solution
    Frankia forms root nodules of non-leguminous plants like actinorhizal plants.
    Rhizobium forms a symbiotic relationship with leguminous plants.
    Azotobacter is free-living nitrogen-fixing bacteria.
    Thiobacillus is not associated with nitrogen fixation.

    So, the correct answer is 'Frankia'
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